Chinese and Kobayashi fuseki
The Black formations combine into a formidable moyo which White almost has to invade. Simply "punishing" the unanswered in the previous diagram, by grabbing the corner at a, will probably not outweigh Black's perfecting his moyo with b, although one can find at least a game between Cho Chikun and Yoda Norimoto where White did exactly so and won the game ...
This is more or less a Global joseki resulting from this opening. White has settled her invading stones in gote. Black uses his natural sente to now return to the unanswered a, combining nicely with and , or move to the widest area with b, which can be considered more active.
One cannot help (at least at my 2d level), that Black's play is very natural and active here.
However, it believes that white's attachment is very good.
In the 2011 Samsung cup, Li Zhe defeated the formidable prodigy Park Junghwan. The variation used here by Li (Black) is , which had been played since at least 1998. would normally be at , since is already closer to the invasion than the standard pattern. One can feel the strong resistance by both professionals in almost every next move. The result of the skirmishes had White sacrifice the lower right, in exchange for swallowing on a large scale as well.